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If you'll notice, I have 2 schraders on my hybrid, one on the valve, one on the chamber. when I need to vent, I just pump a bit of air through the chamber airline and allow it to vent through the valve.

Also, I can fire without venting, but the power and sound output drop noticeably

1. load ammo.2. charge gun with fuel and air to firing pressure through rear schraeder, sealing piston valve.3. fire gun.4. pump in air through front schraeder to vent chamber through barrel (valve stays open after firing).5. repeat.

Hmm, I'm only asking questions because for years I've been pursuing the Holy Grail of the auto-loading, repeating hybrid, and the chamber venting is one of the two remaining problems I've got to resolve.

Who knows, perhaps you don't need to vent it at all? If you add the correct fuel/air mix into a chamber full of combustion gases would it actually through out the fuel/oxygen in air ratio?